The 600s already have the radio and IR receivers built in. The OP just needs to decide what level of the features are to be controlled off camera and how to do it for the cost. My thought is that the best thing would be to have a solution that offers a lot of functionality. Others may not care about that through... if you are 5 feet from the camera you might not need what you would want if you are 100’ from the camera, my experience.
rcarol wrote:
That all depends on how often you plan to use it. If you only need it for a one-time situation, then it doesn't make much sense to invest a small fortune on triggers/receivers. However, if you need TTL performance or you plan to use it often, then the added investment would be worth it.